Winding ma



Jan. 10, 1939. o. BOCHMANN 2,143,297

WINDING MACHINE WITH DRIVING DRUM DRIVE FOR THE WINDING BOBBIN Filed Dec. 31, 1936 Inventor:

Mjmw

Patented Jan. 10, 1939 UNITED STATES PATENT OFFICE WINDING MACHINE WITH DRIVING DRUM DRIVE FOR THE WINDING BOBBIN Application December 31, 1936, Serial No. 118,668 In Germany February 25, 1936 1 Claim.

.This invention relates to a winding machine in which the winding bobbin is driven by a driving drum.

The known winding machines of the type are 5 open to the objection that thin threads, especially thin artificial silk threads, easily break when the machine is started. This is due to the fact, that the driving drum keyed on the driving shaft and consequently the winding bobbin quick- 1y get up to full speed during the starting so that the thread at the moment of starting up is sub jected to heavy strain which, in the case of fine thread material, leads to fracture of the thread. Winding machines are also known in which the driving drum is mounted on the'driving shaft in such a manner that the drum is first rotated by the friction of the bearing surfaces and then. when a certain speed of rotation has been attained, is positively connected with the driving shaft by a centrifugal clutch or the like. Al-

though with this arrangement an immediate sud-' den rotation of the driving drum by the shaft does not take place at the moment of starting up as is the case in other driving drum winding machines, the drive is nevertheless still too strong and sudden to enable very fine artificial silk threads to be wound without danger. This is due to the fact that thedriving drum or its bore tightly encircles the whole circumference of the driving shaft. This known machine is suitable for relatively coarse threads but breakages repeatedly occur with fine threads when starting up the machine. Furthermore. these winding devices possess the additional disadvantage that they are of complicated construction and conse-.

quently expensive to manufacture.

The driving drum winding machine according to the invention differs from the known constructions in that the driving drum with a relatively 0 large bore is mounted eccentrlcally and radially shiftable on the driving shaft so that it is driven thereby by rolling friction. Furthermore, a manually operated, oscillating engaging and disengaging lever is provided according to the invention and carries below the driving drum a roller,

supporting plate or the like for lifting and lowering said drum.

This construction presents primarily the advantage that the rotation of the driving drum is efiected only by rolling-friction, so that any sudden starting up is reliably prevented and consequently also fine-threaded artificial silk can be worked without danger. The starting up of the driving drum now takes place gradually and extremely gently, so that the thread being wound can no longer break. Another advantage consists in the extremely simple construction and atfed to this bobbin by a guide 6. For stopping and re-starting the driving drum I, a manually oper- 'ated lever I is provided which is oscillatable about the pin 8 and carries a roller 9 under the drum I. The lever I also has a rod I I) for guiding the thread to the thread guide 5. By raising the lever 1 and holding it in its elevated position by a suitable stop, not shown, the driving drum l is raised off the shaft 2 by the roller 9 and brought to a standstill while the thread guide 6 continues its reciprocation. This movement of the thread guide would stress the thread which is no longer woundon the bobbin 4, and this is avoided by the rod ill on the elevated lever l moving the thread beyond the guide, as shown in dot-and-dash lines. For re-starting the lever is lowered until the driving drum again rests on 1 the shaft which gently sets the drum in rotation; Iclaim: A winding machine especially for winding thin artificial silk threads, comprising in combination, a driving shaft. a driving drum having a bore, and eccentrically mounted on and driven by rolling friction by said shaft, a thread guide associated with said drum, means for raising and lowering said drum to bring said drum out of and into contact with said shaft comprising an oscil-1 latable manually operated lever, a supporting, ro ler on said lever below the driving drum and adapted when said lever is oscillated to engage, said drum to raise and lower the same, and means on said lever over which the thread passes fori shifting the thread out of contact with the thread uide during movement of the lever when the: drum is moved out of frictional contact with said shaft.

O'I'IO BOCHMANN. 

